According to a team from the National Oceanic and Atmospheric Administration’s (NOAA) Earth System Research Lab , the average monthly measurement for greenhouse gas was recorded at 400 parts per million in a remote Arctic location. The finding marks “a troubling new milestone for carbon dioxide,” and increases in greenhouse gas emissions worldwide, which some scientists have warned about for several years. Read the rest of Scientists Report Greenhouse Gas Emissions Have Reached a “Troubling Milestone” Permalink | Add to del.icio.us | digg Post tags: atmosphere emissions , carbon dioxide , greenhouse emissions , greenhouse gases , National Oceanic and Atmospheric Administration , NOAA , noaa greenhouse gas milestone